If riposte is not going to be removed

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At least make it work only against single target attacks. Fiora being able to riposte a Ziggs ult is beyond reasonable.

If that were a valid argument, you'd have to pretty much remove Windwall out of existence.

how about all except ultimates? but then how do you deal with udyr, jayce, karma or nidalee who dont really have ultimates. I guess she just counters them

How About No.